Title: Cisco Unified Communications Manager CTL Provider Heap Buffer Overflow Vulnerability
Severity: CRITICAL
Description:
Cisco Unified Communications Manager (formerly known as CallManager) is the call-processing component of the Cisco Unified Communications System. The Certificate Trust List (CTL) is used by IP phone devices to verify the identity of CUCM servers. The CTL Provider service constructs the authentication credentials and other information that make up the CTL.
The CTL Provider service ('CTLProvider.exe') is prone to a heap-based buffer-overflow vulnerability because of a logic error in the loop that receives socket data. The service is enabled during initial configuration of the CUCM server, or when changes are made to the CTL, and listens on TCP port 2444 by default. A heap-based buffer receives 0x19000 byte chunks of socket data via a loop; loop iterations continue while more than 0x4000 bytes remain on the socket, allowing heap memory to be overwritten at the control of the user.
Attackers can exploit this issue to execute arbitrary code or to cause denial-of-service conditions.
This issue affects the following versions:
Unified CallManager 4.0 and 4.1 prior to 4.1(3)SR5c
Unified Communications Manager 4.2 prior to 4.2(3)SR3
Unified Communications Manager 4.3 prior to 4.3(1)SR1
Affected Products:
- Cisco Unified CallManager 4.0
- Cisco Unified CallManager 4.1
- Cisco Unified CallManager 4.1 (3)SR5b
- Cisco Unified CallManager 4.1(3)SR4
- Cisco Unified CallManager 4.1(3)sr5
- Cisco Unified Communications Manager 4.2 (3)SR2b
- Cisco Unified Communications Manager 4.2(3)sr.2
- Cisco Unified Communications Manager 4.3
References:
- Cisco: Cisco Applied Mitigation Bulletin: Identifying and Mitigating Exploitation
- Cisco Systems: CallManager Product Homepage
- TippingPoint DVLabs: TPTI-08-02: Cisco Call Manager CTLProvider Heap Overflow Vulnerability
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